Firearm upper



FIG. 1 is a perspective view of the firearm upper embodying the new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a bottom view thereof;

FIG. 6 is a front view thereof; and,

FIG. 7 is a rear view thereof.

FIGS. 1-7 show features of a firearm upper in broken lines. These features are shown for environmental purposes and do not form any part of the claimed design. The broken lines immediately adjacent the solid line portions of the design form the boundary of the design, with the broken lines forming no part of the claimed design. 

CLAIM The ornamental design for firearm upper, as shown and described. 